Prioritize Director thread

[aznan]

Quad buffer. I currently have the users go through a simple test first to confirm whether they get the proper projection or not, so I guess I can live with it.

[farshizzo]

Your hardware should ensure that the correct image is displayed to each eye. Your shutter glasses might not be properly synced with your graphics card. Your Vizard code looks fine, so I don't think there is anything wrong there.